Well, we did get in-comic confirmation of the fact that when Winalils does the equivalent of teleporting himself, he can only teleport himself, so his clothing is just a glamour. I wonder if Dawn will provide in-comic confirmation that Black Tongues castrate themselves.

BTW, I wonder if Winalils just isn't all that good at glamouring himself. The glamour on Matty worked fine, but only as long as he was wearing the pymaric necklace that held the spell. Maybe if Winalils could have done that, it would have worked better?